1-3型压电纤维复合材料结构参数对驱动性能的影响

Influence of Structure Parameters of 1-3 Piezoelectric Fiber Composites on Actuation Capability

采用有限元方法对1-3型压电纤维复合材料(Macro-fiber composites,MFC)建立微机电模型,讨论了交叉指形电极关键尺寸、两相结构尺寸对驱动性能的影响。结果表明:分支电极中心距p一定时,取较大的分支电极宽度w可得到较大的自由应变和夹持应力;当分支电极宽度w不变时,随p/w的增加,自由应变增加而夹持应力减小;采用交叉指形电板结构可使1-3型压电纤维复合材料具有较高的横观各向异性,横向效应系数可提高2.3倍。较小的聚合物层厚度a、纤维截面尺寸c有助于提高压电纤维复合材料的驱动性能,较小的纤维间聚合物宽度b有助于提高压电纤维复合材料的自由应变,但夹持应力则相应降低。

The finite element method is adopted to model the micro-electromechanic model of 1-3 piezoelectric fiber composites macro-fiber composites（MFC）. The influences of various key sizes on the transverse actuation capability of actuators are studied. The results indicate that when the electrode spacing p is determined, the bigger electrode width w means higher free strain and clamped stress. When the electrode width w is determined, the free strain and clamped stress decrease along with the increase of the ratio p/w. Smaller thickness of polymer a and micro-fiber width c can improve the actuation capability of actuator. In addition, the free strain will increase but the clamped stress will decrease when higher polymer width b is employed.